: treasury secretary timothy geithner said he's willing to go over it if republicans don't agree to tax hikes for the wealthiest americans. president obama said basically the same thing but added one more hard line to the negotiations. >> if congress in any way suggests that they're going to tie negotiations to a debt ceiling vote and take us to the brink of default once again, as part of a budget negotiation-- which, by the way, we have never done in our history until we did it last year-- i will not play that game. >> late today the president spoke by telephone with house speaker john boehner. no specifics on what they said to each other, but it was their first conversation in a week. eventually the two sides will get down to bargaining over specifics, including entitlements. one idea may be to change the way the government measures inflation. that may sound like a small change, but, as darren gersh reports, it could have a big impact. >> reporter: if the price of oranges goes up, consumers will buy apples and other cheaper foods. we know that. economists call that switching "substitution,"